计算 1)【 (-2x+y)^3*y-x^3*(-2xy^2)^2*1/3 y】÷【(xy^2)^2*(-6x)】
计算3xy[2xy-x(y-2)+x-1]
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算:3xy[2xy-x(y-2)+x]
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(x^2+xy/x-y)/(xy/x-y)计算
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x